First you need to know that you have a total of 30 days to recover deleted files from the Trash, unless you have already backed up the files before deletion. To recover files from the trash folder simply follow the following steps:
- Go to your Drive and navigate to the Trash option on the left pane
- Locate the file(s) to be recovered and right-click on them.
- Select the Restore option from the drop-down menu.
(Note: Permanently deleted files can be recovered by a G Suite Admin within 25 days of deletion from the Trash. Find out how here).